Abstract: Yun Tong Ji Cheng gives an account of the roundtripping's content of the first official transport which transporting the copper made in Yunnan to Beijing in the 20th year of the Crown Title of Daoguang.The route and the travel time both were clearly documented in the book,which has important implications for research on the historical changes of transportation which transporting the copper made in Yunnan to Beijing.By using the time limit of the transport recorded in Yun Nan Tong Zhi as a reference,research on the transportation time recorded in Yun Tong Ji Cheng found that the transport official named Li Xun actually spent 10 months and 10 days,which is 15 days more than the time limit.The departure time of the first and second official transport from Kun ming both are 20 days later than the Deadline.

Key words: the year of 1840, the copper made in Yunnan, transportation to Beijing, time limit, Yun Tong Ji Cheng